Box-part and blank therefor



Sept. 24, T935. 0. D. KNOWLTON BOX PART AND BLANK THEREFOR Filed Dec. 8, 1933 Patented Sept. 24, 1935 UNITED STATES BOX-PART AND BLANK THEREFOR Qutler D. Knowlton, Beverly, Mass., assignor to Hoague-Sprague Corporation, Lynn, Mass., a corporation of Massachusetts Application December 8, 1933, Serial No. 701,511

Claims.

This invention relates to box-parts, such as a box proper or its cover, and the blanks from which they are formed.

In the manufacture of boxes of the set-up type, in which pairs of side-wings and end-wings or walls rise from a body-portion and pairs of corner-laps extend from the ends of the side-wings inside the end-wings, it is customary to conceal the vertical raw edges of the shell-material in the end-wings by cover-paper turned over them during the formation of the blanks. If prelined stock is to be used for the production of the blanks, these raw edges will remain visible, detracting from the appearance of the boxes. Even with the edges of the end-wings covered, the; end-formation tends to be unsightly because the outer faces of the comer-laps adjacent to the creases can not be wholly concealed by the endwings and the joints are not so neat as might be desired. An object of my invention is to provide a box-part which is attractive in appearance and which also ofiers increased resistance to deformation together with a blank therefor.

This box-part, to give such a result, has the general walland corner-lap-structure above outlined, and said corner-laps are located inwardly from the ends of the pairs of walls to which they are attached to furnish recesses, in which recesses the other pair of walls lie substantially flush with the juncture of the associated walls and the corner-laps. In this way the end-walls may be located wholly between the side-walls with the corner-laps fully concealed, the ends of the box presenting substantially plane surfaces broken only by a line at each edge of the end-wings. The recesses are preferably'produced by offsets connecting the side-wings to the corner-laps, and, as herein illustrated, the inner faces of these offsets contact with the opposed face of the corresponding side-wing, thus furnishing a brace which strengthens the endformation. By having the side-edges of the endwings beveled, they may be caused to fit snugly within the recesses, thus reducing the space between them and the offset-portions to a minimum and giving the effect of an almost unbroken end-surface. The blank for this box has ofiset portions connecting the side-wings and corner-laps, these oflsets extending toward the face of the blank which is to be at the inside of the set-up box, in which they extend inwardly from their junctures with the side-wings to furnish the recesses which receive the end-wings.

Abov and hereinafter, the terms "side and "end" have been applied to the blank-wings and box-walls for convenience in distinguishing between the elements. It is not intended, however,

to limit these terms by their relation to the dimensions of the box. The end-formation which includes the corner-laps may furnish the longer 5 wall of the box rather than the shorter and still come within my invention.

The accompanying drawing illustrates a form of the box of this invention, together with the steps by which it is produced;

Fig. 1 shows a fragmentary vertical section of means for producing in box-blanks a crease between the side-wings and corner-laps;

Fig. 2 is a broken perspective view of the creased blank ready for setting-up;

Fig. 3 shows in perspective one extremity of a blank with the side-wings and corner-laps brought to box-form;

Iiig. 4 similarly shows a completed box-end; an

Fig. 5 is anenlarged sectional detail on the line VV of Fig. 4.

The blank b employed in the production of this box may be generally that of Letters Patent of the United States No. 1,811,135, Knowlton, June 23, 1931. This has a body-portion l0, opposite side-wings l2, 12, intermediate opposite end- Wings l4, M with extensions l6, and corner-laps l8 projecting from the opposite extremities of the side-wings. Creases 20, which define these elements, may be of the usual double or pinchtype, save only those at 22 between the sidewings and comer-laps. These may be considered as half-creases, the corner-laps being offset from the side-wings, as appears in Fig. 1 of the drawing, in a direction toward the face of the blank which is to be at the interior of the completed box. To permit the creases 22 to fold more readlly and to better remain in position, they may be overbent, the corner-laps somewhat overlapping the side-wings. Fig. 1 shows a simple form of creasing mechanism which may be employed.

A pair of rolls 24, 26 rotate in opposite directions. The roll 24 has at its periphery a shoulder 28 which may be inclined outwardly and forwardly, and with this co-operates a creasing blade 30 pivoted at 32 in a recess in the roll 26. The blank being advanced between the rolls, its contact with the edge 36 of the blade forces said blade toward the shoulder 28. This swings the blade anticlockwise about its pivot against the force of a spring 34 and crowds the blank into contact with the shoulder, bending the offset 22 through somewhat more than 90.

With the blank b brought to the form illustrated in Fig. 2, its setting-up to produce a box B may proceed in the following manner: The side-wings I2 of the blank are folded substantially at right-angles to the body-portion l0 and the pairs of corner-laps at the opposite ends of the blank are folded into alinement as appears in Fig. 3, where but one end of the box is illustrate'd. This brings each offset 22 between the side-walls, there being a rounded edge 40 produced at the juncture of each corner-lap with what is now the side-wall of the box. The inner face 42 of each offset furnishes a shoulder upon the corner-lap which rests againstthe opposed face of the side-wall. In the completed box the entire end-formation is effectively reinforced against displacement, especially if the adjacent ends of the pair of corner-laps contact and intermesh at 43, as disclosed in the Knowlton patent previously mentioned. Bounded by the outer faces of the corner-laps and by the outer faces 44 of the offsets 22 are recesses, the depth of which is preferably just sufficient to receive the end-wings H of the blank when these are folded up to provide the end-walls of the box. This brings the outer face of each end-wall substantially into the plane of the rounded junctures between the side-walls and the offsets of the cornerlaps, so there is produced an almost unbroken plane surface upon each end-wall, there appearing therein only vertical lines 46 where the endwall meets the surface 40 joining the side-walls to the corner-laps. To render these lines as inconspicious as possible, the vertical or side-edges of the end-walls may be inclined or beveled at 48, so they fit snugly against the offset faces 44. Finally the end-wing-extensions ii are turned in against the inside of the corner-laps. Before the folding operation, the outer surfaces of the corner-laps and the inner surfaces of the end-wingextensions will have been coated with, an adhesive, so when these are pressed against the opposite surfaces in setting-up the box the desired form will be maintained, the end-wings being held closely in the recesses with their edges 48 entirely hidden. The resulting end-formation is smooth and attractive and effectively resists the strains to which it may be subjected in use.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

l. A box-part comprising a body-portion, pairs of opposite walls projecting therefrom, and pairs of corner-laps extending toward each other from the ends of one pair of walls, said corner-laps being located inwardly from the ends of the pair of walls to which they are attached to furnish recesses, the other pair of walls lying in said recesses with their outer surfaces substantially in the plane of the junctures between the associated 5 walls and the corner-laps.

2. A box-part comprising a body-portion, a pair of opposite side-wings and a pair of opposite end-wings projecting from the body-portion, corner-laps extending toward each other at the i0 ends of the side-wings, and offsets connecting the side-wings and corner-laps, the inner face of each offset contacting with the opposed face of the corresponding side-wing, the edges of the end-wings being in substantial-engagement with 15 the opposite faces of the offsets and their outer surfaces approximately flush with the rounded edges formed by the turning in of said offsets.

3. A box-part comprising a body-portion, a pair of opposite side-wings and a pair of opposite end-wings projecting from the body-portion, corner-laps extending toward each other at the ends of the side-wings, and offsets connecting the sidewings and corner-laps, the inner face of each offset contacting with the opposed face of the cor- 25 responding side-wing with the attached comerlap located inwardly from the ends of the sidewings to furnish recesses, the end-wings lying in said recesses and provided with beveled edges opposite the outer faces of the offsets. 30

4. A blank for use in making a box-part, said blank comprising a body-portion, side-wings, end-wings and corner-laps projecting from the extremities of the side-wings and offset therefrom toward the face of the blank which is to be at 35 the inside of the box-part when set up, the offset portions being adapted to then extend inwardly from their junctures with said side wings to receive the end-wings between them with the outer surfaces of said end-wings substantially in the 40 plane of the junctures between the side-wings and the corner-laps.

5. A blank for use in making a box-part, comprising a body-portion, side-wings, end-wings and corner-laps projecting from the extremities 45 of the side-wings and offset therefrom toward the face of the blank which is to be at the inside of the box-part when set up and to then furnish recesses for receiving the end-wings with their outer surfaces substantially in the plane of the 50 junctures between the side-wings and the corner-laps.

CUTLER D. KNOWLTON. 

